Vulnerability · Published Nov 21, 2025 · Assigned by wolfSSL
CVE-2025-11931Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt
Low 2.1
In plain English
A low-severity security flaw in wolfSSL from wolfSSL. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)2.1Low
Exploit odds (30 days)0.3%top 72.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Integer Underflow Leads to Out-of-Bounds Access in XChaCha20-Poly1305 Decrypt. This issue is hit specifically with a call to the function wc_XChaCha20Poly1305_Decrypt() which is not used with TLS connections, only from direct calls from an application.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | wolfssl | 5.9.1-r0 | ALPINE-CVE-2025-11931 |
| Alpine:v3.24 | wolfssl | 5.8.4-r0 | ALPINE-CVE-2025-11931 |
| Debian:12 | wolfssl | no fix listed | DEBIAN-CVE-2025-11931 |
| Debian:13 | wolfssl | no fix listed | DEBIAN-CVE-2025-11931 |
| Ubuntu:22.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2025-11931 |
| Ubuntu:24.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2025-11931 |
| Ubuntu:25.10 | wolfssl | no fix listed | UBUNTU-CVE-2025-11931 |
| Ubuntu:26.04:LTS | wolfssl | no fix listed | UBUNTU-CVE-2025-11931 |
| Ubuntu:26.10 | wolfssl | no fix listed | UBUNTU-CVE-2025-11931 |
Affected products (as reported)
Weakness: CWE-191 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N