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CVE-2024-7246

HPACK table poisoning in gRPC C++, Python & Ruby

MEDIUM
5.3
CVSS Score
Published: August 6, 2024 at 10:14 AM UTC
Updated: June 17, 2026 at 08:19 AM UTC
1 product affected across 1 vendorGrpc

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

It's possible for a gRPC client communicating with a HTTP/2 proxy to poison the HPACK table between the proxy and the backend such that other clients see failed requests. It's also possible to use this vulnerability to leak other clients HTTP header keys, but not values. This occurs because the error status for a misencoded header is not cleared between header reads, resulting in subsequent (incrementally indexed) added headers in the first request being poisoned until cleared from the HPACK table. Please update to a fixed version of gRPC as soon as possible. This bug has been fixed in 1.58.3, 1.59.5, 1.60.2, 1.61.3, 1.62.3, 1.63.2, 1.64.3, 1.65.4.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Grpc· Grpcnpm
95%
v < 1.58.31.59.0 ≤ v < 1.59.51.60.0 ≤ v < 1.60.21.61.0 ≤ v < 1.61.31.62.0 ≤ v < 1.62.31.63.0 ≤ v < 1.63.21.64.0 ≤ v < 1.64.31.65.0 ≤ v < 1.65.41.53.01.53.11.53.21.54.01.54.11.54.31.55.01.55.11.55.31.55.41.56.01.56.11.56.21.56.31.56.41.57.01.57.11.58.01.58.11.58.21.59.01.59.11.59.21.59.31.59.41.60.01.60.11.61.01.61.11.61.21.62.01.62.11.62.21.63.01.63.11.64.01.64.11.64.21.65.01.65.11.65.21.65.3
Affected range stops below 1.58.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.59.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.60.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.61.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.62.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.63.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.64.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.65.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

ExploitIssue TrackingPatch
Source: [email protected]
https://github.com/grpc/grpc/issues/36245

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-440NVD-CWE-noinfo

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