PatchTheCVECVE-2025-0838: There exists a heap buffer overflow vulnerable in Abseil-cpp
CVE-2025-0838 is a critical-severity flaw (CVSS 9.8) affecting common libraries, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
There exists a heap buffer overflow vulnerable in Abseil-cpp. The sized constructors, reserve(), and rehash() methods of absl::{flat,node}hash{set,map} did not impose an upper bound on their size argument. As a result, it was possible for a caller to pass a very large size that would cause an integer overflow when computing the size of the container's backing store, and a subsequent out-of-bounds memory write. Subsequent accesses to the container
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 50%) |
| CISA exploited list | No |
| Weakness | CWE-190 |
| Published | 2025-02-21 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-0838?
common libraries: upgrade to 20250127.0; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2025-0838 being exploited?
CVE-2025-0838 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-0838 affect?
CVE-2025-0838 affects common libraries, debian linux. Severity is critical (CVSS 9.8). There exists a heap buffer overflow vulnerable in Abseil-cpp. The sized constructors, reserve(), and rehash() methods of absl::{flat,node}hash{set,map} did not impose an upper bound on their size argument. As a result, it was possible for a
How urgent is CVE-2025-0838?
Priority 57/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist