CVE-2026-124023 Apache Axis2/C: Out-of-bounds read in the Guththila XML reader wrapper
Unauthenticated clients can send malformed XML to Axis2 servers using Guththila, causing heap out-of-bounds reads or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-124023?
CVE-2026-124023 is a memory corruption vulnerability in Apache Axis2/C, published on 12 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Out-of-bounds Read vulnerability in the Guththila XML parser wrapper of Apache Axis2/C. On some malformed XML input the Guththila parser returned a raw input byte in place of an event code, and the AXIOM reader wrapper used that value as an index into a ten-entry lookup table without checking its range, reading heap memory past the end of the table. An unauthenticated client could trigger this by sending a crafted XML request to a server built with Guththila, the default parser, causing the request to be parsed incorrectly or, in some cases, the process to crash. The memory read is not returned to the client. This issue affects Apache Axis2/C: through 2.0.0. The fix is available in commits 23110287924e79d05a5b4712298c355d1f05c606 and f01683ec10e8fddb87279ec9351b3239021223e6 and will be included in the next release.
Weakness: CWE-125
Which versions are affected by CVE-2026-124023?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-124023?
No fix has been published for CVE-2026-124023 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-124023 being exploited?
There is no known exploitation of CVE-2026-124023 in the wild and no public exploit code.
Sources
Also known as GHSA-qv28-p6jq-5h3f.