CVE-2026-41898: Openssl · Unchecked callback lengths in PSK and cookie callbacks
Affects opensslSource GCVE Database
Not known to be exploited : upgrade to 0.10.78 soon.
Data as of 10 Nov 2026, 14:22 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
- Patch
- Available – fixed in 0.10.78
Exploitation evidence
Disclosed: evidence found.
CVE published 19 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.
What to do
Upgrade openssl to 0.10.78.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
crates.ioopensslpkg:cargo/opensslOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade OpenSSL to version 0.10.78 or later, where the vulnerability is fixed by validating callback return lengths. No other mitigations are specified or required.
Description
A vulnerability in OpenSSL versions from 0.9.24 up to but not including 0.10.78 allows unchecked callback lengths in PSK and cookie callbacks. Callbacks that return a length larger than their buffer cause OpenSSL to read beyond the buffer's end. For cookie callbacks, this can lead to disclosure of adjacent memory over the network. The issue is fixed in version 0.10.78 by validating the returned length against the buffer size and treating excessive lengths as callback failures.