OW2 ASM 3.0 before 9.11 contains an uncontrolled recursion vulnerability in ClassWriter.replaceAsmInstructions() that allows attackers to cause denial of service through crafted class files
Affects asmSource GCVE Database
Not known to be exploited · CVSS 6.8 Medium.
Data as of 28 Oct 2026, 22:31 UTC
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 14 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10asmpkg:deb/ubuntu/asm?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSasmpkg:deb/ubuntu/asm?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSasmpkg:deb/ubuntu/asm?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSasmpkg:deb/ubuntu/asm?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 20.04 LTSasmpkg:deb/ubuntu/asm?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu 18.04 LTSasmpkg:deb/ubuntu/asm?arch=source&distro=bionicOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
OW2 ASM 3.0 before 9.11 contains an uncontrolled recursion vulnerability in ClassWriter.replaceAsmInstructions() that allows attackers to cause denial of service through crafted class files. Attackers can supply a class with a large method containing many long forward jumps, triggering unbounded toByteArray() recursion and a StackOverflowError during transformation.
References
- ubuntu.com/security/CVE-2026-110259 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-110259 (opens in a new tab)
- asm.ow2.io/versions.html (opens in a new tab)
- gitlab.ow2.org/asm/asm/-/blob/ASM_9_10_1/asm/src/main/java/org/objectweb/asm/ClassWriter.java (opens in a new tab)
- gitlab.ow2.org/asm/asm/-/commit/e9aca627c17e1619bcb8059afb43382dac6b275f (opens in a new tab)
- gitlab.ow2.org/asm/asm/-/merge_requests/459 (opens in a new tab)
- vulncheck.com/advisories/ow2-asm-3.0-before-9.11-uncontrolled-recursion-via-classwriter-replaceasminstructions (opens in a new tab)