Targets Juniper Junos routing daemon used in core networks; successful exploitation can cause routing outages and widespread network disruption.
CVE-2026-101976
Juniper Junos rpd OOB write via malformed BGP update causes DoS
Is CVE-2026-101976 being exploited?
Not confirmed. CVE-2026-101976 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-101976?
CVE-2026-101976 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-101976?
Not known from our data. No patch reference has been recorded for CVE-2026-101976, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-101976 affect?
CVE-2026-101976 affects Juniper Junos OS, Junos OS Evolved, rpd (routing protocol daemon). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-101976?
Apply Juniper advisory/mitigations, restrict and validate eBGP peers, monitor rpd and BGP sessions.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote Denial-of-Service of rpd via crafted eBGP update (no 4-octet-AS), crashing routing daemon and causing routing/service outages.
Immediate action required
- affected< 23.2R2-S7.7
- affected>= 23.4 and < 23.4R2-S8.13
- affected>= 24.2 and < 24.2R2-S5.5
- affected>= 24.4 and < 24.4R2-S5
- affected>= 25.2 and < 25.2R2-S2
- affected>= 25.4 and < 25.4R1-S3
- affected>= 26.2 and < 26.2R1-S2
- affected< 23.2R2-S7.7-EVO
- affected>= 23.4 and < 23.4R2-S8.11-EVO
- affected>= 24.2 and < 24.2R2-S5.6-EVO
- affected>= 24.4 and < 24.4R2-S5-EVO
- affected>= 25.2 and < 25.2R2-S2-EVO
- affected>= 25.4 and < 25.4R1-S3-EVO
- affected>= 26.2 and < 26.2R1-S2-EVO
- affected23.4X100
- affected>= 25.2X100 and < 25.2X100-D35-EVO
- affected>= 25.4X300 and < 25.4X300-D40-EVO
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.