chore(deps): update rust crate anyhow to v1.0.103 [security] #10

Merged

azer merged 1 commit from renovate/crate-anyhow-vulnerability into master

2026-09-04 21:39:56 +00:00

Renovate commented

2026-08-22 21:04:57 +00:00

Collaborator

This PR contains the following updates:

Package	Type	Update	Change
anyhow	dependencies	patch	`1.0.102` → `1.0.103`

Unsoundness in `Error::downcast_mut()`

RUSTSEC-2026-0190

More information

Details

Affected versions of this crate violate borrow rules, resulting in undefined behavior, when the user adds context to an error via Error::context and then later calls Error::downcast_mut on the returned Error.

The flaw was corrected in commit 6e8c000 by revising how the mutable reference is constructed, avoiding inclusion of a shared reference in the resulting borrow chain.

Example

use anyhow::Error;
use std::fmt;

#[derive(Debug)]
struct ErrorContext(&'static str);

impl fmt::Display for ErrorContext {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Display::fmt(&self.0, f)
    }
}

fn main() {
    let mut error = Error::msg("inner error").context(ErrorContext("old context"));
    let context: &mut ErrorContext = error.downcast_mut().unwrap();
    context.0 = "new context";
    println!("{:?}", error);
}

Miri output

error: Undefined Behavior: trying to retag from <1538> for Unique permission at alloc602[0x38], but that tag only grants SharedReadOnly permission for this location
   --> src/ptr.rs:170:18
    |
170 |         unsafe { &mut *self.ptr.as_ptr() }
    |                  ^^^^^^^^^^^^^^^^^^^^^^^ this error occurs as part of retag at alloc602[0x38..0x48]
    |
    = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental
    = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information
help: <1538> was created by a SharedReadOnly retag at offsets [0x38..0x48]
   --> src/ptr.rs:89:18
    |
 89 |             ptr: NonNull::from(ptr),
    |                  ^^^^^^^^^^^^^^^^^^
    = note: stack backtrace:
            0: anyhow::ptr::Mut::<'_, ErrorContext>::deref_mut
                at src/ptr.rs:170:18: 170:41
            1: anyhow::error::<impl anyhow::Error>::downcast_mut::<ErrorContext>
                at src/error.rs:560:18: 560:46
            2: main
                at examples/downcast_mut.rs:15:38: 15:58

Severity

Unknown

References

This data is provided by OSV and the Rust Advisory Database (CC0 1.0).

Release Notes

dtolnay/anyhow (anyhow)

`v1.0.103`

Compare Source

Fix Stacked Borrows violation (UB) in Error::downcast_mut (#451, #452)

Configuration

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🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

If you want to rebase/retry this PR, check this box

This PR has been generated by Mend Renovate CLI.

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [anyhow](https://github.com/dtolnay/anyhow) | dependencies | patch | `1.0.102` → `1.0.103` | --- ### Unsoundness in `Error::downcast_mut()` [RUSTSEC-2026-0190](https://rustsec.org/advisories/RUSTSEC-2026-0190.html) <details> <summary>More information</summary> #### Details Affected versions of this crate violate borrow rules, resulting in undefined behavior, when the user adds context to an error via `Error::context` and then later calls `Error::downcast_mut` on the returned `Error`. The flaw was corrected in commit `6e8c000` by revising how the mutable reference is constructed, avoiding inclusion of a shared reference in the resulting borrow chain. ##### Example ```rust use anyhow::Error; use std::fmt; #[derive(Debug)] struct ErrorContext(&'static str); impl fmt::Display for ErrorContext { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { fmt::Display::fmt(&self.0, f) } } fn main() { let mut error = Error::msg("inner error").context(ErrorContext("old context")); let context: &mut ErrorContext = error.downcast_mut().unwrap(); context.0 = "new context"; println!("{:?}", error); } ``` ##### Miri output ``` error: Undefined Behavior: trying to retag from <1538> for Unique permission at alloc602[0x38], but that tag only grants SharedReadOnly permission for this location --> src/ptr.rs:170:18 | 170 | unsafe { &mut *self.ptr.as_ptr() } | ^^^^^^^^^^^^^^^^^^^^^^^ this error occurs as part of retag at alloc602[0x38..0x48] | = help: this indicates a potential bug in the program: it performed an invalid operation, but the Stacked Borrows rules it violated are still experimental = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md for further information help: <1538> was created by a SharedReadOnly retag at offsets [0x38..0x48] --> src/ptr.rs:89:18 | 89 | ptr: NonNull::from(ptr), | ^^^^^^^^^^^^^^^^^^ = note: stack backtrace: 0: anyhow::ptr::Mut::<'_, ErrorContext>::deref_mut at src/ptr.rs:170:18: 170:41 1: anyhow::error::<impl anyhow::Error>::downcast_mut::<ErrorContext> at src/error.rs:560:18: 560:46 2: main at examples/downcast_mut.rs:15:38: 15:58 ``` #### Severity Unknown #### References - [https://crates.io/crates/anyhow](https://crates.io/crates/anyhow) - [https://rustsec.org/advisories/RUSTSEC-2026-0190.html](https://rustsec.org/advisories/RUSTSEC-2026-0190.html) - [https://github.com/dtolnay/anyhow/issues/451](https://github.com/dtolnay/anyhow/issues/451) This data is provided by [OSV](https://osv.dev/vulnerability/RUSTSEC-2026-0190) and the [Rust Advisory Database](https://github.com/RustSec/advisory-db) ([CC0 1.0](https://github.com/rustsec/advisory-db/blob/main/LICENSE.txt)). </details> --- ### Release Notes <details> <summary>dtolnay/anyhow (anyhow)</summary> ### [`v1.0.103`](https://github.com/dtolnay/anyhow/releases/tag/1.0.103) [Compare Source](https://github.com/dtolnay/anyhow/compare/1.0.102...1.0.103) - Fix Stacked Borrows violation (UB) in `Error::downcast_mut` ([#451](https://github.com/dtolnay/anyhow/issues/451), [#452](https://github.com/dtolnay/anyhow/issues/452)) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate).

Renovate added 1 commit

2026-08-22 21:04:57 +00:00

chore(deps): update rust crate anyhow to v1.0.103 [security] d4648f7396