CVE-2026-27171
Published: February 18th, 2026
zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.
LOW
CVSS v3: 2.9
CVSS v3: 2.9
Status
| DocFilters Release | Package | State | Justification | Comment |
|---|---|---|---|---|
| 0.0.0.1 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 26.1.1 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 26.1 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 25.4 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 25.3 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 25.2 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 25.1.2 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 25.1.1 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 25.1 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 24.4 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 24.4.0 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 24.3 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 24.2.1 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 24.2 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 24.1 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 23.3 | zlib (1.3) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 23.2.1 | zlib (1.2.12) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 23.2 | zlib (1.2.12) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 23.1 | zlib (1.2.12) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 22.4 | zlib (1.2.12) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 22.3 | zlib (1.2.12) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 22.2 | zlib (1.2.12) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 22.1 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 21.11.1 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 21.11 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 21.8.1 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 21.8 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 21.5.1 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 21.5.0 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 21.2.0 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.20 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.19.3667 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.18.3599 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.17 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.16.3445 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.15.3368 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.14.3263 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.13.3179 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.12.3054 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.11.3040 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.11.2990 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.10.2934 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.9.2878 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
| 11.4.8.2822 | zlib (1.2.11) | Not Affected | Code Not Reachable | Document Filters never calls crc32_combine64, crc32_combine_gen64, crc32_combine, or crc32_combine_gen. The vulnerable x2nmodp infinite loop can only be triggered by passing a negative length to these combine functions — a code path that Document Filters does not exercise. |
Severity score breakdown
Attack Complexity
HIGH
Attack Vector
LOCAL
Availability Impact
LOW
Base Score
2.9
Base Severity
LOW
Confidentiality Impact
NONE
Integrity Impact
NONE
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
NONE
Vector String
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Version
3.1